7f-8=13

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Solution for 7f-8=13 equation: 



7f-8=13

We move all terms to the left:

7f-8-(13)=0

We add all the numbers together, and all the variables

7f-21=0

We move all terms containing f to the left, all other terms to the right

7f=21

f=21/7

f=3

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